逆向き運動対象の交差時に見られる反発現象

概要

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Kanizsas (1979) ostrich appeared as if he were dancing in a very curious fashion. His legs actually passed one another but they seemed to be bouncing back to their original end point. The bounce effect appeared also in the opposite motions of rotating disks. At the meeting on a circular path, they were not seen passing one another but bouncing off; one of them was seen remaining throughout on one side and the other remaining throughout on the opposite side. The smaller the difference between the speeds of colliding objects, the more often the bounce effect was seen. When the moving disks were moved at very high speeds, they always showed the bounce effect at each meeting. The bounce effect was more frequently perceived in binocular vision than in monocular, and in the brightly lit surroundings than in the dark ones. The factors of symmetry and smoothness determining the bounce effect seen in opposite motions were discussed.